Importance

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Abstract

The present invention provides an initial position setting method of grinding wheels, before starting a grinding operation, in a vertical double disc surface grinding machine for surface grinding the upper and lower grinding surfaces of a work-piece simultaneously by rotation-driving a pair of grinding wheels by a grinding wheel rotation drive motor and moving the grinding wheels up and down by a grinding wheel vertical drive motor. This method comprises a moving stroke (#1, #4) for rotating the grinding wheels (2, 3) by the grinding wheel rotation drive motors (46), and vertically moving the grinding wheels (2, 3) by the motors for elevating/lowering the grinding wheels (41) toward ground surfaces of the work-piece (W) from a setting-start position (Q1) which is vertically separated away from the ground surfaces of the work-piece (W), a detection stroke (#2, #5) for detecting contacts between the grinding wheels (2, 3) and the ground surfaces of the work-piece (W), and stopping the vertical movement of the grinding wheels (2, 3) based on the detection, and an initial position setting stroke (#3, #6) for vertically moving the grinding wheels (2, 3) by the motors (41)for elevating/lowering the grinding wheels, by a predetermined amount in a direction separating away from the ground surfaces of the work-piece (W).

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First Claim